I have been noticing the dropping and updating of some website's page ranks in the last week. Also the number of backlinks have been showing a change on different data centers from the last week of March. These are signs of an update. My guess is that Page rank is being updated by google and its according to the anticipated date by a lot of people. April's the month for changes I guess..
So after the Jan update, the signs are of an April PR update.. which might stabilize over the next two weeks... Keep an Eye
For those wondering what a Google PR is, Read this